.kou_box{
    width: 100%;
    height: 100%;
    /* background-color: plum; */
}
.preview{
    width: 48%;
    height: 63%;
    float: left;
    /* background-color: lightblue; */
    margin-top: 120px;
}
.preview img{
    width: 100%;
    height: 100%;
}
.processed-preview{
    width: 50%;
    height: 64%;
    float: right;
    /* background-color: lightblue; */
    margin-top: 21px;
}
.processed-preview img{
    width: 100%;
    height: 100%;
}